Motor vehicle accessory system



Feb. 4, 1941. E Q HORTON 2,230,595

MOTOR VEHIFCLE ACCESSORY SYSTEM Filed Ma rchA, 1937 2 Sheets-Sheet 2 INVENT'OR Engyn Qfiovton,

AT RNEYS Patented Feblf 4, 19 41 7 UNITED STATES PATENT OFFICE f MOTOR VEHICLE ACCESSORY SYSTEM' ui-win o. Horton, Hamburg, N. Y assignor to Trico Products Corporation, Buflalo, N. Y.

Application March 4, 1937, Serial No. 129,027

5 Claims. (01.230-170) p This invention relates to a motor vehicle acces- Fig. 6 is a detailed view of a part of the heat sory system and primarily to an air pump dissipating means employed; and adapted to be driven from a moving part of the Fig. 7 is an enlarged view through one of the vehicle to serve as a source of actuating pressure pump valves illustrating on an enlarged scale'its for one or more accessories with which the presen action. A day motor vehicle is equipped. Referring more particularly to the drawings,

It has heretofore been proposed to provide an the numeral I designates the main or chambered air pump driven from the crank shaft of a motor section of the pumphousing havinga chamber vehicle engine, the connection between the pump 2 which is alternately enlarged and ensmalled by and its drive being made through a play connecthe -fluid displacing member or piston generally 1 provision of a pump wherein the valves controlltion for enabling the pump to operate interindicated at 3. mittently or only as may be necessary to meet The illustrated piston construction partakes of the demands of the accessory system. Such part the diaphragm type and, as depicted, embodies a time operation of the pump placed the connecting pair of body plates 4 and 5 which have their drive under severe strain and through shortened m r in l p r n t e nn edge of an 15, strokes the pump was subjected to much wear annulag weglii e or g ag l lras fi T e ort er e i e and tear. Furthermore, the pump was noisy in of the an agm is y hel n a Sea 0 6 operation and required a low speed drive or n s e sect o I y a y suitable e s. 1 I source of power, such as the engine crank shaft, Such a y a ring? W c y e l pp 11111 for greatest efliciency. This was primarily due to lockingly Over the t s da p r1118 certain factors, including theinertia of thewalves g g f ih m ng a Dali; of fig 1112111112118 sec-i as well as the recoiling of the valve s rings, on 0 6 P 011s e a? constituting problems which have long coni onted is Preferably firmed P rubber that W1ng the manufacturer of pumps and resisted his efs i 5 or fi 23 forts to provide an eflicient pum for all s eds ng g opera e 2 of operation developed by present day machi n ery. intermediate Portion of the diaphragm may be The present invention has for its object to formed pelfmanent m if desired to provide a practical pump of the reciprocatory further. guard against the phr m Webbin type which is eflicient at various speeds of operafoldmg' upon itselfthereby weakemng its ,tion and. is particularly adapted foruse on motor structure The body plates. 4 and 5 of the vehicle power plants to serve as a source of are secured together at their centers by the tubuoperating pressure for-air driven accessories. 12 332 g s z zg fig 2: 3:31;:

Moreparticularly the invention resides in the edge of the webbing to space the plates apart.

for forming a valve chamber I2 hereinafter referred to. The tubular bolt is internally threaded to adjustably receive the threaded endof a connecting rod l3, and consequently reciprocation of the connecting rod will obviously impart like as high speeds of of the Pump movement to the connected portion of the piston.

The invention further has for its object to pro- The pump' chamber 2 is provided t an inlet vide a pump which is longlived, the parts being port I4 and an outlet port I5, the latter being. designed and combined as to render e mm preferably provided in the piston and opening into durable in use and ewnomical in manufacturethe valve chamber thereof. These ports are In the acmmpanymg drawings, showing a valve controlled, and an important feature of this pmPtical embodiment t inventmni invention is the formation and mounting of the 1 is Vertical Section through the p p valves by which they are rendered highly sensiing the inlet and outlet ports are highly sensitive to changes of fluid flowandare so mounted and disposed as to operate with great rapidity in opening and closing their respective ports at low showing it operatively related to its drive; tive for rapid opening and closing movements Fig. 2 is a transverse section through the pump whether the pump is operating "slowly or at an ex-- d ec t cessively high speed.

Fi s. 3 and! are r sp y 11 i? and b m According to the preferred embodiment each p n v w of t upper section of the p mp valveis flexible and freely movable in action. It

housin comprises a flat annular member I6 w? Fig. 5 is a top plan view of the fluid displacing loosely guided (on a boss II in the case of 'the member or piston; inlet valve and on the tubular bolt I0 in the case of the outlet valve), and is held on the valve seat It by an overlying piece of felt it or other light and springy fiber which may be readily carried with the valve in its opening movement without materially retarding its opening progress, while at the same time providing a sufficient resiliency for urging it toward its seat. The felt is lightly matted and yet n sufiicient body to afford a resilient backing for the valve. A retaming disk 2| holds the felt on the inlet valve while the plate 5 of the piston assembly serves a like function in connection with the felt of the outlet valve. The piston plate: I is provided with one or more openings 2i through which the air may leave the valve chamber i2.

Each valve [6 is of sufficient lightness and possessed of such broad surface area as to float or move promptly with changes in the direction of flow of the air currents. For this P11 11 6 the valve is exceedingly thin, substantially foil-like in thickness, and is formed of a metal having. resilient and self-sustaining characteristics. By

way of illustration, a brass valve having a thickness of .002 of an inch has proved practical in giving to the valve a body sufficient to respond quickly to directional changes in air flow as well as properly seal the valve port. Furthermore, each valve is flexible in character to render it selfconforming to its seat and thereby effect a betteraccomplishthis reed-like movement of the valve the port is disposed to one side of the guiding boss so that the air movement through the port will cause the valve to flex at one side from its seat regardless ofthe delay in the opposite side portion of the valve to follow such given tendency. By reason of its loose mounting on the pulsation dampening chamber 22 at one side thereof. The inlet port It opens from the opposite side of the chamberthrough a fllter orscreen 24 between the port and the nipple 22the chamber is provided with one or more baflles 28 which serve to dampen the pulsations resulting from the rapid inflow of air increments. The chamber 22 is accessible upon removal of a cover plate 2' which is detachably secured as by the screw 21, a'suitable packing gasket 28 underlying the closure plate 20.. The fllter or screen 2| is detachably held in position by a split retaining ring 20, the latter'havlng upstanding lugs ll serving as a flnger hold and also cooperating I with the closure plate in preventing unauthorized displacement of the resilient retaining ring.

The intermittent air exhaustion from the pump, after passing through the piston 2| into the chamber 3|, is muiiled by a fibrous body 32 which is composed of a stack of lightly felted disksenclosed by the sp e necting rod II. This flbrous body is readily compressible andexpansible with the movement f ceedingly quiet in operation.

This-- the pump piston and at the same time permits the air to readily iiow therethrough. The mounting section 0 of the pump housing is formed with an opening it through which the connecting rod it freely moves unguided by walls thereof, the clearance space between the wall of the opening and the pump or connecting rod if being more or less fully bridged by a closure disk or ring 34 of light felt. wearing ring 25 on which the spring It as well as the feltbody 22 are also supported.' The felt body 32 and the felt ring 24 are primarily for dampening the pulsations or puffs of air as they flow from the pump chamber 2| at the exhaust side of the pump so as .to render the latter ex The pump isoperated from a rapidly revolving part of the motor vehicle, such as the shaft 20 of the generator 3 on which the pump is conveniently mounted as by a bracket 38. By this arrangement the pump will supply ample pressure or suction for accessory operation whether the vehicle engine is operating slow or fast. The shaft 36,'or an extension 20 thereof. is-provided with a crank pin 40 having a throw suilicient to reciprocate the pump piston ina'practical and satisfactory manner. By way of example, the total throw of the crank II when determined at approximately .170 of an inch has been found to be satisfactory and practical for both fast and slow, piston operation without subjecting the parts to unnecessary, wear and tear and at the same time give the desired degree of suction or vacuum for the eiiicient operation of air driven accessories.

The degree of suction or operating pressure may be regulated by varying the clearance space piston may be determined. The more the clear- A ance in chamber 2 is reduced at the uppermost position of the piston, the greater will be the degree of vacuum produced by the pump.

is joined to a bearing sleeve 42 on the crank ll by a.transverse pivotpin 42 which permits a certain amount of relative movement incidental to the unguided reciprocation of the connecting The lower end of the composite connecting rod' This ring is held in position by a rod. The bearing sleeve 42 is provided with-a divided bushing 44 including an oil containing pad 45 which may'have its oil supply conveniently replenished through an opening 46 in the,

bearing sleeve 42. 'Ihe divided bushing 44 is preferably formed of wood oil impregnated since it stands up well at high speed and requires little lubrication. v

' However, wood is a poor conductor of heat and when the pump is operating ata speed of 5000 or 6000 R. P. M. the heat generated would ordinarily be so great as to readily impair the bearing. v To avoid this impairment and thereby lengthen the period of usefulness of the parts, means are provided to dissipate the heat generated. According to the present disclosure the heat dissipating-means comprises a heat conducting rod 41 which .will readily absorb and transmit the heat from the crank pin and maintain thelatter at a comparatively low temperature. The heat conducting rod may be of aluminum, by way of example, and is fltted into an axial boreformed in the outer end of the crank ll,

such heat transmitting pin extending sufllciently cess'ively high speeds of rotation.

The valve disc or member, while stated as being preferably of metal, is flexible so as to readily conform to the surface about the port which it closes. This does away with the necessity of accurately grinding or finishing off the valve seat.

The valve possesses a certain degree of inherent resiliency so as to flex from and toward the seat. By having the port to one side of the valve anchorage, the valve will easily open by lifting from its seat, such flexing movement of the valve being progressive along the opposite sides of the valve anchorage. The fibrous pad or felt l9 provides a flexible backing for the valve during this bending movement. The progressive movement of the line of bend is followed by such flexible backing so as to provide for greater uniformity and efliciency in the valving action. By use of .this flexible valve backing, which provides sufllcient resiliency to normally hold the valve disc on its seat, the valve may readily flex transversely as well as 'move or creep about its point of loose anchorage,

the pressure applied to the valve by the fibrous backing being substantially uniform at alltimes, regardless of the creeping action of the valve. Furthermore, the fibrous backing is of very light formation and imposes very little additional weight upon the valve so that the latter is free to respond to changes in the air movements through the underlying port. While in some instances the fibrous backing may be eliimnated, yet for quietness and greater efliciency in the operation of the pump under all operating conditions, the presence of the flexible backing is desired.

The pump is quiet in operation, the spring i3 serving at all times to hold the piston or air displacing member, with its operating parts, under tension to avoid all rattle and loose play in the mechanism. I

While the foregoing description hasbeen given in detail it is merely illustrative of the inventive principles involved which may be applied to other physical embodiments without departing from the scope and spirit of the invention claimed.

What is claimed is:

1. A fluid check valve for an airpump compris- I ing a port and a valve comprising an annular resilient disc with its marginal portion seating over the port, and means loosely fitting in the central opening of the valve and acting to guide bodily movement of the latter to and from its seat, the marginal portion of the disc being flexible to enable its having both bending and bodily movements, and said disc being free to rotate about its guide means.

2. A fluid check valve for a high speed air pump, comprising a guide post, a disc centrally apertured freely to receive the post for loose bodily movement thereon and having valving margins transversely flexible for movement away from and toward the valve seat along lines of bend progressing transversely of the guide post, the

.central aperture of the disc having suflicient clearance about the post to permit the flexing to progress at opposite sides of the post. .a

3. A fluid check valve for a high speed air pump, comprising a valve disc centrally apertured to be mounted loosely on a guiding post for free bodily movement thereon and having its marginal portions readily flexible during the initial portion of the bodily movement to initiate such bodily movement.

4. A high speed air pump comprising a housing provided with a chamber, and a' short stroke fluid displacing member movable back and forth from and to a position of substantially total collapse of the chamber, said pump having inlet and outlet passages provided with valve means for effecting uni-directional flow of air through the ,cham-ber,the valve means for one of said passages comprising an annular disc freely guided at its center for bodily movement and of such resiliency as to flex concurrently with thebodily movement. 5. A high speed suction air pump having a chamber and arelatively movable, fluid displacing member with means for operating the moving one of said elements, inlet and outlet passages for the chamber, and valve means for each of the passages comprising .port means and a readilyflexible disc of approximately .002 of an, inch in thickness and guided at its center for bodily movement with its marginal portions tree .to flex and bodily move concurrently from the port means. i

' ERWIN C. HORTON. 

